Abstract
Based on the aeroengine lubricating oil system test bench, this paper used a dimensional analysis method to establish a mathematical model for predicting the separation efficiency and resistance of a dynamic pressure oil-air separator suitable for engineering. The analysis of the multivariate nonlinear fitting error and the experimental data showed that the established separation efficiency and resistance model could accurately predict the separation and resistance performance of the dynamic pressure oil-air separator within a certain range; the average error of the four separation characteristic prediction models was 3.5%, and the maximum error was less than 16%. The model that was established by the least square method had the highest accuracy; the average error of the multivariate nonlinear fitting of the four resistance characteristic prediction models was less than 4%, and the maximum error was less than 15%, which could be used to predict the resistance performance of the separator. The applicable working condition of the model is lubricating oil flow rate 4.3~8.5 L/min and oil-air ratio 0.5~3.
Highlights
The phenomenon of gas-liquid separation exists widely in various industrial production fields, from biopharmaceutical and petroleum exploitation to aerospace
This paper uses the principle of dimensional analysis to establish a prediction model for the separation characteristics and resistance characteristics of a dynamic pressure oil-air separator, analyzes the multiple nonlinear fitting errors, and compares with experimental data to verify the accuracy of the model
(2) As the flow rate increases, the separation efficiency gradually decreases; as the diameter of the outlet pipe increases, the separation efficiency gradually increases; the maximum separation efficiency appeared at l1/l2 = 0:19
Summary
The phenomenon of gas-liquid separation exists widely in various industrial production fields, from biopharmaceutical and petroleum exploitation to aerospace. Due to the existence of the two-phase mixture of oil and air, the flow field has a International Journal of Aerospace Engineering complex change of the two-phase interface All these factors all increase the difficulty of the separator design and optimization process. Zhu et al [15] studied the outlet forms at the bottom of the separator by using RSM and discussed the influence of different outlet forms on the flow field distribution They believed that the single tangential outlet is more conducive to improving the separation efficiency. This paper adopts the dimensional analysis method and combines with the experimental data of the separator to establish the prediction model of the dynamic pressure oil-air separator’s characteristics based on the main physical parameters affecting the performance of the separator. The prediction model can effectively predict the separation efficiency and resistance performance of the separator after the error test analysis and model verification, so as to provide a reference for the design and improvement of the separator
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